1. Department of Internal Medicine and Specialties; Faculty of Medicine and Biomedical Sciences; University of Yaoundé I; Yaoundé Cameroon
2. Department of Internal Medicine; Yaoundé General Hospital; Yaoundé Cameroon
3. Noncommunicable Disease Unit; Ministry of Public Health; Yaoundé Cameroon
4. Department of Medicine; Groote Schuur Hospital and University of Cape Town; Cape Town South Africa
5. Medical Diagnostic Center; Yaoundé Cameroon
6. National Advanced School of Engineering; University of Yaoundé I; Yaoundé Cameroon
7. Department of Disease Control; Ministry of Public Health; Yaoundé Cameroon